WHAT DOES THE WORD “THEM” IN LINE 7 REFER TO

80. What does the word “them” in line 7 refer to ? A. materials. B. environmentalists. C. Renewable natural resources.D. non - renewable natural resources .B Nowadays, you don’t need to be at home or at the office to use the phone. You can carry a mobile phone in your pocketor keep onein your car. With a mobile phone, anyone who can talk and walk can also phone and walk. You don’t have tolook for a pay phone to make a call anymore. Now you can take your calls with you everywhere. pay phone = public telephone